How do I create a solid with events?

If this is covered somewhere else, let me know where to find it:

How do I create a solid with events?

Situation: top down with a big (the "wall") and small square (the player).

I tried: if the player is on the left of BigSquare, check if it is overlapping and if so, place it at BigSquare.BBoxLeft.

If the player is below BigSquare: check if it is overlapping and if so, place it at BigSquare.BBoxBottom

I also did this with the other 2 sides.

But this doesn't work, because I think it checks both (all) conditions. I think it should ignore the 2nd check, if it is on the left side and vice versa.

Well i guess you can do wait 0.0 set oldx and oldy to current x and current y

then trigger on player overlap wall, if oldx is less than the wall's x, it means the player came from the left so set the player'S position to like wall.x - ( wall.width/2 + payer.width/2 ) to put the player at the edge of the wall on the left or seomthing

You can do anything you want